Studio Technologies IFB Plus 2007 - Manual (Page 12)

Issue 9, January 2006 Model 2 User Guide
Page 12 Studio Technologies, Inc.
interrupt works quite well, better than you
may think. (Actually better than we thought,
too, until we tested it!) Try it out and you
may soon find more applications than you
expected.
Talent Amplifier Output
The talent amplifier output is designed to
supply power and audio signals for up to
four Model 32A or Model 33 Talent Ampli-
fiers. The talent amplifier output exits the
Model 2 via one 3-pin male XLR-type con-
nector. Pin 1 is common, pin 2 is +22 Vdc
modulated with channel 1 audio, and pin
3 is channel 2 audio. For convenience, it is
expected that the talent amplifier output will
be wired to a main input/output (I/O) panel,
along with microphone, camera, and other
various connections. This will allow easy
talent amplifier connection using standard
flexible microphone cable. The distribution
panel does not really need more than two
talent amplifier output connectors that are
“multed” from the Model 2’s talent ampli-
fier output. Each Model 32A and Model 33
Talent Amplifier has both a female and a
male 3-pin XLR-type connector. This allows
the talent amplifier interconnecting cables
to be “looped” through the talent amplifiers.
This will simplify and, in most cases, reduce
the amount of cabling required to connect
multiple talent amplifiers.
Line Outputs
Associated with each of the two IFB
channels is an electronically balanced line-
level output with a nominal signal level of
+4 dBu. The line outputs are capable of
driving balanced or unbalanced, low or high
impedance loads. The line outputs exit the
Model 2 via two 3-pin male XLR-type con-
nectors. Prepare the mating connectors
(female XLRs) so that pin 2 is positive (+ or
hot), pin 3 is negative (– or cold), and pin 1
is shield. To connect to an unbalanced load
connect pin 2 to positive (+ or hot) and pins
1 and 3 to shield.
Some installations may use the line outputs
to drive wireless IFB transmitters. In other
installations they may be used for special
applications, such as feeding a satellite
uplink. For maximum flexibility it is recom-
mended that the line outputs be wired via
audio patch points, even if you have a dedi-
cated application.
The Model 2’s audio quality and flexibility
make it a useful tool for non-IFB applica-
tions. Not to “toot our own horn,” but the
Model 2’s sonic quality is as good as many
audio consoles, storage devices, etc. As an
example, the frequency response from pro-
gram input to line output is better than
±0.5 dB from 20 Hz to 20 kHz. This makes
using one of the IFB channels as a four
input, one output audio source selector for
an uplink application completely valid. Let
the Model 2 become a useful part of your
facility’s “bag of tricks!”
Connecting Telephone Lines
Words of Caution: As with any product,
installing the Model 2 requires a safety-first
approach.
Never install telephone wiring during a light-
ning storm. Never install telephone jacks in
wet locations unless the jack is specifically
designed for wet locations. Never touch
non-insulated telephone wires or terminals
unless the telephone line has been discon-
nected at the network interface. Use caution
when installing or modifying telephone lines.